Add explanation of client and cluster types, per code review
Add explanation of client and cluster types, per code review

jml/flocker,1d4Nf6/flocker,LaynePeng/flocker,adamtheturtle/flocker,mbrukman/flocker,mbrukman/flocker,wallnerryan/flocker-profiles,agonzalezro/flocker,jml/flocker,wallnerryan/flocker-profiles,adamtheturtle/flocker,hackday-profilers/flocker,1d4Nf6/flocker,w4ngyi/flocker,lukemarsden/flocker,1d4Nf6/flocker,mbrukman/flocker,achanda/flocker,lukemarsden/flocker,agonzalezro/flocker,wallnerryan/flocker-profiles,LaynePeng/flocker,adamtheturtle/flocker,moypray/flocker,jml/flocker,Azulinho/flocker,Azulinho/flocker,agonzalezro/flocker,moypray/flocker,hackday-profilers/flocker,AndyHuu/flocker,achanda/flocker,AndyHuu/flocker,LaynePeng/flocker,lukemarsden/flocker,AndyHuu/flocker,moypray/flocker,Azulinho/flocker,w4ngyi/flocker,w4ngyi/flocker,achanda/flocker,hackday-profilers/flocker